Stock availability
Every product page informs you whether the product is currently available for purchase or out of stock.
If you see a "Buy Now" or “Add to cart” button on the product page it means the product is currently available for purchase.
If you see an "Out of Stock" or "Learn more" button it means the product is currently out of stock.
When the product is back in stock this will change to "Buy now" or “Add to cart” and allow you to proceed with the purchase.